Create Fillable PDF Form Dynamically in C#

I need a little C# function or a small application where i can select some point in a PDF document and then create a PDF text field starting from the selected point at a given width and height. All i need is to get to know how to do [login to view URL] need of good interfaces and [login to view URL] make sure it works and send me the code for review. 10mins work for some in expertise in this [login to view URL] you are using 3rd party libraries you need to send it to me [login to view URL] open source PDF libraries i think we can avoid this problem. Awaits your bids.